The Multi-Channel VOA (VA20/VA24) from Chem Optics is a Fiber Optic Attenuator with Wavelength Dependent Loss 0.5 to 1 dB, Attenuation 10 to 20 dB, Insertion Loss 1.3 to 1.5 dB, Return Loss 42 dB(Cross talk), Polarization Dependent Loss 0.4 to 0.6 dB. More details for Multi-Channel VOA (VA20/VA24) can be seen below.